diff options
Diffstat (limited to 'drivers/block/mxc_ata.c')
| -rw-r--r-- | drivers/block/mxc_ata.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/block/mxc_ata.c b/drivers/block/mxc_ata.c new file mode 100644 index 0000000..f22f4f4 --- /dev/null +++ b/drivers/block/mxc_ata.c @@ -0,0 +1,146 @@ +/* + * Freescale iMX51 ATA driver + * + * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> + * + * Based on code by: + * Mahesh Mahadevan <mahesh.mahadevan@freescale.com> + * + * Based on code from original FSL ATA driver, which is + * part of eCos, the Embedded Configurable Operating System. + * Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <command.h> +#include <config.h> +#include <asm/byteorder.h> +#include <asm/io.h> +#include <ide.h> + +#include <asm/arch/imx-regs.h> +#include <asm/arch/clock.h> + +/* MXC ATA register offsets */ +struct mxc_ata_config_regs { + u8 time_off; /* 0x00 */ + u8 time_on; + u8 time_1; + u8 time_2w; + u8 time_2r; + u8 time_ax; + u8 time_pio_rdx; + u8 time_4; + u8 time_9; + u8 time_m; + u8 time_jn; + u8 time_d; + u8 time_k; + u8 time_ack; + u8 time_env; + u8 time_udma_rdx; + u8 time_zah; /* 0x10 */ + u8 time_mlix; + u8 time_dvh; + u8 time_dzfs; + u8 time_dvs; + u8 time_cvh; + u8 time_ss; + u8 time_cyc; + u32 fifo_data_32; /* 0x18 */ + u32 fifo_data_16; + u32 fifo_fill; + u32 ata_control; + u32 interrupt_pending; + u32 interrupt_enable; + u32 interrupt_clear; + u32 fifo_alarm; +}; + +struct mxc_data_hdd_regs { + u32 drive_data; /* 0xa0 */ + u32 drive_features; + u32 drive_sector_count; + u32 drive_sector_num; + u32 drive_cyl_low; + u32 drive_cyl_high; + u32 drive_dev_head; + u32 command; + u32 status; + u32 alt_status; +}; + +/* PIO timing table */ +#define NR_PIO_SPECS 5 +static uint16_t pio_t1[NR_PIO_SPECS] = { 70, 50, 30, 30, 25 }; +static uint16_t pio_t2_8[NR_PIO_SPECS] = { 290, 290, 290, 80, 70 }; +static uint16_t pio_t4[NR_PIO_SPECS] = { 30, 20, 15, 10, 10 }; +static uint16_t pio_t9[NR_PIO_SPECS] = { 20, 15, 10, 10, 10 }; +static uint16_t pio_tA[NR_PIO_SPECS] = { 50, 50, 50, 50, 50 }; + +#define REG2OFF(reg) ((((uint32_t)reg) & 0x3) * 8) +static void set_ata_bus_timing(unsigned char mode) +{ + uint32_t val; + uint32_t T = 1000000000 / mxc_get_clock(MXC_IPG_CLK); + + struct mxc_ata_config_regs *ata_regs; + ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR; + + if (mode >= NR_PIO_SPECS) + return; + + /* Write TIME_OFF/ON/1/2W */ + val = (3 << REG2OFF(&ata_regs->time_off)) | + (3 << REG2OFF(&ata_regs->time_on)) | + (((pio_t1[mode] + T) / T) << REG2OFF(&ata_regs->time_1)) | + (((pio_t2_8[mode] + T) / T) << REG2OFF(&ata_regs->time_2w)); + writel(val, &ata_regs->time_off); + + /* Write TIME_2R/AX/RDX/4 */ + val = (((pio_t2_8[mode] + T) / T) << REG2OFF(&ata_regs->time_2r)) | + (((pio_tA[mode] + T) / T + 2) << REG2OFF(&ata_regs->time_ax)) | + (1 << REG2OFF(&ata_regs->time_pio_rdx)) | + (((pio_t4[mode] + T) / T) << REG2OFF(&ata_regs->time_4)); + writel(val, &ata_regs->time_2r); + + /* Write TIME_9 ; the rest of timing registers is irrelevant for PIO */ + val = (((pio_t9[mode] + T) / T) << REG2OFF(&ata_regs->time_9)); + writel(val, &ata_regs->time_9); +} + +int ide_preinit(void) +{ + struct mxc_ata_config_regs *ata_regs; + ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR; + + /* 46.3.3.4 @ FSL iMX51 manual */ + /* FIFO normal op., drive reset */ + writel(0x80, &ata_regs->ata_control); + /* FIFO normal op., drive not reset */ + writel(0xc0, &ata_regs->ata_control); + + /* Configure the PIO timing */ + set_ata_bus_timing(CONFIG_MXC_ATA_PIO_MODE); + + /* 46.3.3.4 @ FSL iMX51 manual */ + /* Drive not reset, IORDY handshake */ + writel(0x41, &ata_regs->ata_control); + + return 0; +} |